Fraser immediately made his professional debut following college to finish the 2006–07 season in the post-season with the Chicago Wolves of the American Hockey League. Curtis initially signed in the East Coast Hockey League with the Las Vegas Wranglers for the 2007–08 season and after 4 games with the Wranglers he was signed to a professional try-out contract with AHL affiliate, the San Antonio Rampage on November 15, 2007.[2] Tasked as a grinding role-player in the AHL, Fraser remained with the Rampage for the duration of the campaign, to post 6 points and 85 penalty minutes in 41 games, including a career best two-goal game against the Milwaukee Admirals on January 23, 2008.[3] He was then returned to the Wranglers for the post season and scored 7 goals in 16 games on their run to the Kelly Cup finals.

Fraser signed with the Peoria Rivermen for his third professional season in 2008–09. He played in a career high 65 games with the Riverman for 8 points and 90 penalty minutes. In game 4 of the first round playoff series against the Houston Aeros, Curtis had his hand injured by a slapshot from teammate Steve Wagner causing him to miss the Rivermen's last three playoff games and had surgery to insert pins into his broken right hand.[4]

Unable to earn a one-way contract with the Rivermen for the 2009–10 season, Fraser was invited to the Wilkes-Barre/Scranton Penguins training camp before suffering a dislocated shoulder in a exhibition game on September 19.[5] He opted to then sign with the Rivermen's ECHL affiliate, the Alaska Aces, which marked a return from his college career days with the UAF.[6] In an injury plagued year Fraser regained some offensive productivity with 13 points in a limited 17 games.

On September 20, 2010, Fraser returned to the Aces and was re-signed to a one-year contract.[7] Invited on a try-out to attend the Lake Erie Monsters training camp for the 2010–11 season, Fraser made the Monsters opening season roster and made his AHL return in a 2-1 victory over the Syracuse Crunch on October 9, 2010.[8][9]